1 Kings 18:28 - Joseph Benson’s Commentary on the Old and New Testaments

They cried aloud They were so far from being convinced and put to shame by the just reproach which Elijah cast upon them, that it made them the more earnest and violent in their proceedings, and induced them to act more ridiculously. A deceived heart having turned them aside, they could not deliver their souls by inquiring, Is there not a lie in our right hand? And cut themselves after their manner, &c. Observe their zeal! They mingled their own blood with their sacrifices; as knowing by experience, that nothing was more acceptable to their Baal (who was indeed the devil) than human blood; and hoping thereby to move their god to help them. And this indeed was the practice of divers heathen in the worship of their false gods. Plutarch, in his book De Superstitione, tells us that the priests of Bellona, when they sacrificed to that goddess, were wont to besmear the victim with their own blood. The Persian magi, according to Herodotus, used to appease tempests and allay the winds by making incisions in their flesh. They who carried about the Syrian goddess, as Apuleius relates, among other mad pranks, were every now and then cutting and slashing themselves with knives, till the blood gushed out; and even to this very day, we are informed, in Turkey, Persia, and in several parts of the Indies, there are a kind of fanatics who think they do a very meritorious service, and highly acceptable to the deity, by cutting and mangling their own flesh.” Calmet, and Picart's Religious Ceremonies.